“I tested it with Dr.Chesky's Binaural album and Depeche Mode flacs. What I like most is of course bass response..it is more than enough, maybe a bit exaggerated, aggressive. Overall, I am really satisfied this excessive response in some genres.The only real problem it is prone to loudness noise of the record.. Maybe this is because the drivers are too sensitive. I am not that high end...” --ajlan

“i hate when they do that. i was using kdx100 & kdx200 for nearly 1 year and i did spent a stable $120 for the two. now i'm realizing actually the $15 ruk30 and $7 plug weren't much worse. kdx200 was a little different from ruk30 at least, but comparing plug to kdx100 just hurts... this was something i was expecting after ruk30 vs kdx200 comparison but god knows i wasn't expecting a totally...” --vaziyetu

“i spent the year 2014 with testing budget earphones and koss company never disappointed me. buying kdx100 was undoubtedly my best decision. it was kind of unplanned because my intention was to find something better than ruk30; and kdx200 as the pricier one, was looking like a better target.
but i decided to give a chance to this one. because it was looking very different...” --vaziyetu

“Pros and Cons section pretty much explains everything. i advice you to read my updated ruk30 review first to get an idea about this earphone: http://www.head-fi.org/products/koss-ruk-30k-noise-isolating-in-ear-stereophone-black/reviews/11943
there is not much to talk specifically about kdx200 here. it shares nearly the same driver with ruk30 and costs 3 times more while offers...” --vaziyetu

SportBud headphones by Koss are molded in the colors of your favorite NCAA team, including their collegiate logo This 2 pair pack of ultra-lightweight in-ear SportBuds is perfect for music on the go You get both home and away colors This dual portable stereophone unit includes a see-through, compact, wind-up spool carrying case for easy storage and protection when not in use 4-foot straight...

These earbud headphones feature an isolating ring that seals out external distractions so you can enjoy your favorite music as it was meant to sound. The headphones include 3 sizes of ear cushions for a comfortable fit.

The KE/29 is lightweight with an in-the-ear design for deep bass and listening to music on the go. The KE/29 features a dynamic element that is positioned just outside the ear for extended frequency response of 15-20,000Hz. The KE/29 includes small, medium and large silicone ear cushions for a customized fit to enhance isolation when you want to eliminate ambient sounds that interfere with the...